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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [catanq.c] - Blame information for rev 740

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1 740 jeremybenn
/* Return arc tangent of complex __float128 value.
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   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, write to the Free
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   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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   02111-1307 USA.  */
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#include "quadmath-imp.h"
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__complex128
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catanq (__complex128 x)
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{
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  __complex128 res;
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  int rcls = fpclassifyq (__real__ x);
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  int icls = fpclassifyq (__imag__ x);
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  if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE)
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    {
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      if (rcls == QUADFP_INFINITE)
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        {
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          __real__ res = copysignq (M_PI_2q, __real__ x);
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          __imag__ res = copysignq (0.0, __imag__ x);
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        }
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      else if (icls == QUADFP_INFINITE)
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        {
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          if (rcls >= QUADFP_ZERO)
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            __real__ res = copysignq (M_PI_2q, __real__ x);
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          else
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            __real__ res = nanq ("");
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          __imag__ res = copysignq (0.0, __imag__ x);
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        }
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      else if (icls == QUADFP_ZERO || icls == QUADFP_INFINITE)
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        {
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          __real__ res = nanq ("");
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          __imag__ res = copysignq (0.0, __imag__ x);
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        }
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      else
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        {
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          __real__ res = nanq ("");
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          __imag__ res = nanq ("");
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        }
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    }
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  else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)
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    {
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      res = x;
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    }
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  else
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    {
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      __float128 r2, num, den;
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      r2 = __real__ x * __real__ x;
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      den = 1 - r2 - __imag__ x * __imag__ x;
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      __real__ res = 0.5 * atan2q (2.0 * __real__ x, den);
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      num = __imag__ x + 1.0;
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      num = r2 + num * num;
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      den = __imag__ x - 1.0;
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      den = r2 + den * den;
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      __imag__ res = 0.25 * logq (num / den);
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    }
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  return res;
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}

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